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Ubuntu 12 04 Getting Started With LXC

This tutorial is just going to get you hitting the ground running with LXC to prick your interest. As such there is no heavy manipulation of config files or advanced features.

To install LXC and get inside a container simply run the following commands:

sudo apt-get install lxc -y
sudo lxc-create --template ubuntu --name [CONTAINER NAME]

# Wait a significant period of time...

# Start the container and enter into it
sudo lxc-start -d --name [CONTAINER NAME]
sudo lxc-attach --name [CONTAINER NAME]

# have some fun in the container
# exit back out to the host with the "exit" command

# Stop the container when you are finished
sudo lxc-stop --name [CONTAINER NAME]

You can use lxc-start without the -d switch to start the container and automatically enter it. The username will be ubuntu and the password will also be ubuntu, but I had difficulties exiting properly and recommend always using the -d option shown above.

References

• Ask Ubuntu - What is LXC and how to get started?

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Ubuntu 12 04 Set Docker To Use the LXC Container Engine

As of Docker 0.9, docker does not use LXC by default for the container engine. However, one may find it useful to do so, in order to attach to running containers with a new TTY.

Method 1 - Installation Script

Simply copy the following script into a file and execute it with

#!/bin/bash

# Ensure running bash not sh etc
if ! [ -n "$BASH_VERSION" ];then
 echo "this is not bash, calling self with bash....";
 SCRIPT=$(readlink -f "$0")
 /bin/bash $SCRIPT
 exit;
fi

# Ensure running as root user
USER=`whoami`

if [ "$USER" != "root" ]; then
 echo "You need to run me with sudo!"
 exit
fi

apt-get update && apt-get install lxc -y
echo DOCKER_OPTS="-e lxc" >> /etc/default/docker
service docker restart

Method 2 - Manual Steps

Ensure that you already have LXC installed by running the following command

sudo apt-get install lxc -y

Edit the /etc/default/docker file and adding "-e lxc" as shown below:
Restart the docker service by running
sudo service docker restart
or by rebooting the server

References

• Bindable - Make lxc-attach work again with docker 0.9
• Stack Overflow - Docker-enter-running-container-with-new-tty

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